PowerPoint 4: Plumbing Fixings and Screws

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Questions and Answers

Which type of screw is ideal for securing items in a corrosive atmosphere?

Zinc screws

Chrome screws

Steel screws

Brass screws (correct)

What is the primary use for expanding plastic wall plugs?

Mounting bathroom fixtures

Fixing mirrors

Securing heavy items in masonry

Plasterboard applications (correct)

Which screw style has a head that sinks flush or below the surface of wood?

Raised countersunk

Mirror screw

Countersunk (correct)

Round head

What is the correct drill size for an 8-10 gauge screw?

6 mm Signup and view all the answers

Which fixing is best suited for general purpose inside use under dry conditions?

Steel Signup and view all the answers

For what purpose are mirror screws most commonly used?

Fixing bathroom fittings Signup and view all the answers

Which type of fixing is not typically used for plasterboard?

Fischer bolt basin set Signup and view all the answers

What characteristic distinguishes sheradised screws?

Only suitable for limited outside use Signup and view all the answers

What is the purpose of clipping pipes in plumbing?

To secure pipes against movement Signup and view all the answers

Which of the following screw head types is commonly used for screws with a decorative finish?

Chrome Signup and view all the answers

What is the primary purpose of interlocking clips in pipework?

Ensure uniformity in the pipework run Signup and view all the answers

Which type of clip can help reduce noise and vibration in pipe installations?

Munsen ring with rubber inset Signup and view all the answers

For a 22mm copper pipe, what is the horizontal clipping distance?

1.8m Signup and view all the answers

What is NOT a reason for establishing clipping distances?

To accommodate greater pipe diameters Signup and view all the answers

What is the recommended vertical clipping distance for a ½″ LCS pipe?

2.4m Signup and view all the answers

Which of the following clips can be used for both copper and plastic pipes?

Interlocking clip Signup and view all the answers

For soil and waste pipes, what is the recommended vertical distance for soil pipes?

1.5m Signup and view all the answers

What is a characteristic of smaller diameter pipes compared to larger ones?

They are weaker under stress Signup and view all the answers

Which type of surface is typically involved in the construction of hidden internal fabric?

Plasterboard Signup and view all the answers

What type of clip is recommended for horizontally supporting 28mm plastic pressure pipe?

Single push-in clip Signup and view all the answers

Study Notes

PowerPoint 4: Fixings and Components in Plumbing

Fixings and components used in common plumbing processes are the focus of this presentation.
Learners will identify fixings, clips, clipping distances, surfaces, buried cable, buried pipework, and different fixing methods for various surfaces.
Measurements of clipping distances and surface identification are also important learning outcomes.
Performance of fixings on different surfaces is also a focus.

Screw Styles

Various screw types exist for different applications, including countersunk, cross-head, Pozi drive, raised countersunk, round head, mirror, coach, and chipboard.
Different screw styles include countersunk (flat), double countersunk, countersunk (oval), raised, round head, and domed.
Countersunk screws sit flush with the surface, while others do not.

Types of Screws

Different screw styles are classified based on their head shapes.
Examples include full-bearing, washer-faced, double-chamfered, square, slotted-hexagon, countersunk, raised-countersunk, round, pan, cheese, raised-cheese (fillister), mushroom (truss), hi-torque, Phillips countersunk, Phillips raised countersunk, Phillips round-pan, Phillips round, countersunk button, hexagon socket, flat or cap hexagon socket, and knurled head.

Common Head Types

Flat blade screws are used with slotted screws, and care should be taken to ensure the correct blade size for the screw slot.
Phillips screws were originally designed in the 1930s to prevent over-tightening.
Pozidriv screws are similar to Phillips screws but with an eight-pointed star shape for a better grip. They are not compatible with Phillips screws.
Star head screws are used in specialized installations and appliances. Also known as Torx screwdrivers.
Hexagon head screws (Allen keys) are commonly used in the gas industry for appliance servicing and installation.

Materials for Screws

Brass screws are resistant to corrosion and suitable for high moisture areas. They are expensive but have a long lifespan. Concealed use, such as in bathrooms, is also an appropriate application for brass.
Stainless steel screws, like brass, are very resistant to corrosion; this makes them suitable for high moisture areas, inside or outside use, and commercial applications. Expensive and long-lasting.
Steel screws are a general-purpose type suitable for dry conditions, generally for interior use. Relatively cheap and durable.
Chrome screws provide a decorative finish and are expensive and long-lasting. Used in exposed areas, including bathrooms.
Zinc screws are general-purpose for interior and exterior use; they are also resistant to corrosion, cheap, and durable.
Sheradised screws have limited outdoor use only.

Plasterboard Fixings

Expanding plastic wall plugs and expanding metal cavity fixings are common choices.
Spring toggle fixings are another plasterboard fastening system.
Self-cutting fixings (self-tapping screws for metal) are also used for plasterboard.

Masonry Fixings

Rawl bolts, self-tapping wall bolts, Fischer bolt basin sets, and standard plastic wall plugs are common masonry fixings.

Screw, Drill, and Plug Sizes

Screw sizes (gauge) relate to drill sizes (mm) and matching plug colours for proper installation.

Pipe Clipping Distances

Clipping distances vary based on the pipe material (copper, LCS, plastic pressure pipe). Specific distances are listed for 15mm, 22mm, and 28mm pipes.
Horizontal clipping spacing and vertical clipping spacing are provided, depending on the pipe material.

Clipping Distances for Soil and Waste

Specifications for horizontal and vertical clipping distances for soil and waste pipes are listed.

Clip Compatibility with Different Surfaces

Compatibility of various clips with different surfaces (copper, LCS, Plastic PP).

Reasons for Clipping Distances

Pipe support
Limiting pipe sagging (especially when heated).
Plastic pipes sag more than other pipe materials when heated.
Smaller pipe diameters being weaker
Vertical and horizontal forces also differ.

Surfaces in Building Fabric

The presentation includes images of surfaces such as brickwork, blockwork, studwork, plasterboard, wood, and tiling.

Study Questions

List 5 different screw styles
List 5 different screw head styles.
Describe the purpose of a mirror screw.
List some plasterboard fixings.
List some masonry fixings.
Explain why the correct clip spacing is crucial.
Give examples of different types of clips.
State the clipping distance for vertical 15mm copper piping.

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Description

This quiz focuses on the various fixings and components used in plumbing, with an emphasis on identifying different screw styles and their applications. Learners will explore measurements, surfaces, and performance of fixings in common plumbing processes. Understanding screw types, including countersunk and round head screws, is also a key aspect of this presentation.